Ok, what I found important to post here (it can be read in the first post of mverta here):

http://www.starwarslegacy.com/forums/showthread.php?t=4

Quote (mverta):

"There is an incredible amount of grain in the transfers, which is not part of the masters they come from (I've seen them). To be honest, it's not so much grain, as it looks like dirt - the film stocks used for those movies are not that grainy. In any case, this, and a ton of other evidence, has led people like me to strongly suspect they've been deliberately grained up, or in other ways made sure to look like an inferior release next to the 2004's."

With the transfers he means the GOUT, just read the post linked above.